Rainbow Six Extraction is getting a second post-launch Crisis Event. Called Nightmare Fog, the Crisis Event adds a new gameplay mode, Protean enemy, and Prestige feature to the game. Though the enemy and Prestige feature will remain in the game going forward, the new gameplay mode will only be available during the event.
Nightmare Fog introduces the titular vapor as the main gameplay gimmick in the new limited-time mode. Standing in the fog will increase your neurotoxin level–a brand-new threat you and your squadmates will have to manage. Upon reaching certain thresholds, the neurotoxin will have adverse effects that you’ll have to deal with.
At 30%, you’ll start hallucinating enemies. As hallucinations, these enemies can’t damage you but they look real enough to potentially trick you into wasting ammo or shooting something that causes enough noise that you attract the attention of actual enemies. These aren’t just silent apparitions either–they can make noise too, sometimes audibly popping into existence just within your peripheral to give you a nice jump-scare.
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Source: Game Spot Mashup